In the early years, he and Delia Derbyshire were the "soundsmiths", the others were "tunesmiths". "Delia was manipulating recorded sounds, but in a musical way," Mills explains. "I lent engineering support to her more musical creative talents."
- The New Atlantis article in Sound On Sound magazine, April 2008.
- Woman's Hour 2008-07-25
- Masters of Sound BBC TV documentary
- Whooverville 5 in 2013
- The Sound in Other Media article.